发明授权
- 专利标题: Piercing mill
- 专利标题(中): 穿孔机
-
申请号: US12568698申请日: 2009-09-29
-
公开(公告)号: US08104316B2公开(公告)日: 2012-01-31
- 发明人: Naoya Hirase , Tomio Yamakawa , Kazuhiro Shimoda
- 申请人: Naoya Hirase , Tomio Yamakawa , Kazuhiro Shimoda
- 申请人地址: JP Osaka
- 专利权人: Sumitomo Metal Industries, Ltd.
- 当前专利权人: Sumitomo Metal Industries, Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Clark & Brody
- 优先权: JP2007-090644 20070330
- 主分类号: B21B19/04
- IPC分类号: B21B19/04
摘要:
A piercing mill includes a plurality of inclined rolls, a plug, a pusher, and an undriven guide roll. The pusher pushes a round billet from the rear end at least until the round billet advances for a prescribed distance after contacting the inclined rolls. The guide roll is between the inclined rolls and the pusher and includes a roll shaft and a roll surface, with the roll shaft arranged obliquely with respect to a pass line PL. The sectional shape of the roll surface is a concave arch shape. The round billet is rotated by the guide roll and the friction force generated when the round billet contacts the inclined rolls is reduced. Consequently, the wear of the inclined rolls can be restrained if the round billet is pierced and rolled while it is pushed in between the inclined rolls using the pusher.
公开/授权文献
- US20100011831A1 PIERCING MILL 公开/授权日:2010-01-21